Duplex-tube pneumatic tire



A. WARD DUPLEX TUBE PNEUMATIC TIRE ruly 21, 1925.V 1,546,524

Filed Feb. v, 192A /f/ffd Mrd Patented July. 21, i925.

UNITED STATES ALFRED WARD, or VALLEJO, cALrronNm.

vIDU'PLIEXr-'JTUBE PNEUMATIC TIRE.

Application led February 7, 1924. Serial No. 691,200.

To all whom it may concern.'

Be it known that ALFRED WARD, citizen of the United States of America,` residing at VVallejo, in the county of Solano and State of California, has invented certain new and useful Improvements in Duplex-Tube Pneumatic Tires, of which the following is a specification.

This invention relates to pneumatic tires in which two inner tubes are used and it consists .in the novel features hereinafter def scribed and claimed.

An object of the invention is to provide a duplexA tubev or twin` tube tire structure 1 point or place where repair may be con-n veniently made.

In the accompanying drawing:

The figure is a transverse sectional view of the duplex inner tube tire structure.

As illustrated in the accompanying drawing, the wheel felly 1 is of usual form and the metallic rim 2 is applied thereto in a usual manner thesaid rim being provided at its edffes'with the usual flanges 3.

The tire structure comprises a casing 4 which isprovided at its edges with beads 5 adapted to engage the flanges 3 of the rim Q, in a usuallmanner. The said casing 4 is further provided and at its inner side with a partition wall 6, the opposite side surlfaces 7 of which are concaved as .illustrated in the figure ofthe drawing. The `inner edge portion of the arttion Wall -6 is spread laterally to form anges 8 which are .disposed one at each side of the median radial dimension of the wall 6. A band 9 of rubber is inserted in the inner edge portion of the partition wall 6 to form the flanges 8 5o and the said band 9 is triangular in transverse section. The band 9 is mounted upon especially adapted to beused upon the .the exterior surface of a continuous metallic band 10`and the said band 10 is applied to the edgesof the flanges 8 and retains the band 9 in position between the beads. The inner Ysurface of the band 9 is brought in intimate contact with the intermediate portion of the exterior surface of the rim 2 when the rim is expanded and in condition to be applied to the periphery ofthe felly 1. In the compartments which are formed at the opposite sidesl of the partition wall 6 are located pneumatic inner tubes 11 of usual form.

From. the foregoing description taken in conjunction with the accompanying drawing, it will be seen that the tire structure is provided in which a plurality of tubes may be employed or used and that the multiplication of the number of tubes increases the tread of the 'tire structure and such increase wilI enhance the traction of the tire with the surface of a roadway. The inner tubes may be inflated independently of each other and in the event that one of the tubes should become punctured the other will standup and thus maintain the general shape of the tire so that the driver of the automobile machine may retain control thereof and the machine may be driven to'a point where the necessary repairs may be easily and quickly made and Without interfering with the trip of the machine. v

Having described the. invention,l what is claimed is:

A device of the class described including a continuous metallic band, a band of relatively soft material disposed on the exterior surface of the first band and being triangular in ytransverse section, the edge portions of the first band projecting beyond the side edges of the second band, a tire casing having an intermediate-partition wall divided at its inner edge to form flanges, said flanges lying against the side surfaces of the second band and having their edgesA in contact with the edge portions of the first band, and the casing havin@r beads disposed. beyond the edges of the iirst'band.

In testimony whereof I affix my signature.

ALFRED WARD. 

